Now that we've got the tethering/hotspot and Cellular provider stuff out of the way I guess we could get back to the original question.
Yes I think everything could be made to work as long as you are aware of the possibility of running into data plan issues.
That said have you thought about getting one of these (or one of the other devices like it) and using it instead of a jailbroken iPhone. Seems like it would be a bit cleaner, and you might be able to configure port forwarding etc with it.
As far as the Genie Go, I'm wondering if you could hook it up to the ethernet port of a WCCK, anyone here ever try that? Hooking it up to the WCCK would give it access to your DECA cloud and therefore all his DVRs and Genie. Then the WCCK would hook up over WiFi to his iPhone hot spot. Or does hooking up an ethernet cable to the WCCK turn off it's WiFi?
Sometimes when I reflect back on all the beer I drink I feel ashamed. Then I look into the glass and think about the workers in the brewery and all of their hopes and dreams. If I didn’t drink this beer, they might be out of work and their dreams would be shattered. Then I say to myself, "It is better that I drink this beer and let their dreams come true than be selfish and worry about my liver."
-by Jack Handy